LR3/Disco 3
The centre differential assembly is the primary feature of the transfer box. Torque is transmitted through the centre
differential carrier and distributed to the differential gears and the front and rear output flanges. The planetary gear set, for
the high/low range change function, is also an integral part of the centre differential assembly.
The assembly comprises 3 differential pinion gears (4) and shafts (5), which are equally spaced within the centre
differential carrier (3). The differential shafts have a rigid connection to the differential carrier. Located between the pinion
gears are 3 planetary pinion gears (6) and shafts (7). The planetary sun gear (8) and two differential side gears (10) are
located in the centre line of the carrier.
The planetary ring gear (2) is supported in both directions by the differential casing and the differential cover (9). The
planetary ring gear is connected to a shifting sleeve, which is engaged in either high or low range.
The multi-plate clutch basket (11), which is welded to the differential casing, supports the friction plates, the dogteeth (12)
for high range engagement and the synchronisation cup and spring (1) for the 'shift-on-the-move' function.
Item Part Number
Description
1
-
Synchronisation cup and spring
2
-
Planetary ring gear
3
-
Differential carrier
4
-
Pinion gears
5
-
Pinion gear shafts
6
-
Planetary pinion gears
7
-
Planetary pinion gear shafts
8
-
Planetary sun gear
9
-
Differential cover
10
-
Differential side gears
11
-
Multi-plate clutch basket
12
-
Dogteeth
